Enable GitHub Actions

- Use ubuntu-20.04
- Use Ruby 2.7
- CI against SQLite3, MySQL and PostgreSQL databases
- CI against Rails v6.1.0.rc1, v6.0.3, 6-0-stable, 5-2-stable and v5.2.4
- Add MYSQL_USERNAME and MYSQL_PASSWORD environment variables

.github/workflows/test.yml

@@ -0,0 +1,111 @@
+name: Test
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  sqlite3:
+    runs-on: ubuntu-20.04
+    strategy:
+      fail-fast: false
+      matrix:
+        rails:
+          - v6.1.0.rc1
+          - v6.0.3
+          - 6-0-stable
+          - 5-2-stable
+          - v5.2.4
+    env:
+      DB: sqlite3
+      RAILS: ${{ matrix.rails }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.7
+      - name: Install dependencies
+        run: bundle install
+      - name: Run tests
+        run: bundle exec rspec
+
+  mysql:
+    runs-on: ubuntu-20.04
+    strategy:
+      fail-fast: false
+      matrix:
+        rails:
+          - v6.1.0.rc1
+          - v6.0.3
+          - 6-0-stable
+          - 5-2-stable
+          - v5.2.4
+    env:
+      DB: mysql
+      RAILS: ${{ matrix.rails }}
+      MYSQL_USERNAME: root
+      MYSQL_PASSWORD: root
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.7
+      - name: Startup MySQL
+        run: |
+          sudo systemctl start mysql.service
+      - name: Setup databases
+        run: |
+          mysql --user=root --password=root --host=127.0.0.1 -e 'create database ransack collate utf8_general_ci;';
+          mysql --user=root --password=root --host=127.0.0.1 -e 'use ransack;show variables like "%character%";show variables like "%collation%";';
+      - name: Install dependencies
+        run: bundle install
+      - name: Run tests
+        run: bundle exec rspec
+
+  postgres:
+    runs-on: ubuntu-20.04
+    strategy:
+      fail-fast: false
+      matrix:
+        rails:
+          - v6.1.0.rc1
+          - v6.0.3
+          - 6-0-stable
+          - 5-2-stable
+          - v5.2.4
+    env:
+      DB: postgres
+      RAILS: ${{ matrix.rails }}
+      DATABASE_USERNAME: postgres
+      DATABASE_PASSWORD: postgres
+      DATABASE_HOST: 127.0.0.1
+    services:
+      postgres:
+        image: postgres
+        ports:
+          - 5432:5432
+        env:
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_HOST_AUTH_METHOD: trust
+        # Set health checks to wait until postgres has started
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.7
+      - name: Setup databases
+        run: |
+          psql -h localhost -p 5432 -W postgres -c 'create database ransack;' -U postgres;
+      - name: Install dependencies
+        run: bundle install
+      - name: Run tests
+        run: bundle exec rspec

spec/support/schema.rb

@@ -6,6 +6,8 @@
   ActiveRecord::Base.establish_connection(
     adapter:  'mysql2',
     database: 'ransack',
+    username: ENV.fetch("MYSQL_USERNAME") { "root" },
+    password: ENV.fetch("MYSQL_PASSWORD") { "" },
     encoding: 'utf8'
   )
 when 'pg', 'postgres', 'postgresql'